The roots of the polynomial $$ k(x) = (x - 7)(x + 3) $$ are ...

Question Analysis
This question tests the student's ability to find the roots of a quadratic polynomial that is already factored, which is a key skill in Algebra-1.

Key Concept Explanation
If a polynomial is factored into a product of factors, set each factor equal to zero and solve for .

Step-by-step Solution
1. Start with the factored form:
2. Set each factor equal to zero: and